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Liberal Democrats have underlined their opposition to any airport creation or expansion in the South East after Conservatives called for more capacity.

They will rule out support for an airport in the Thames Estuary and reaffirm opposition to new runways at Heathrow, Gatwick or Stansted.

Cambridge MP Julian Huppert, co-chair of the party's transport committee, said: "With Birmingham looking to expand, Stansted only half full and Gatwick expanding into emerging markets, regional airports and other airports within London can meet demand for the short to medium term."